CVE-2018-19161 in alqo
Summary
by MITRE
alqo through 4.1 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service, exploitable by an attacker who acquires even a small amount of stake/coins in the system. The attacker sends invalid headers/blocks, which are stored on the victim's disk.
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Analysis
by VulDB Data Team • 02/04/2024
The vulnerability identified as CVE-2018-19161 affects the alqo cryptocurrency protocol version 4.1 and earlier, representing a significant denial of service weakness within chain-based proof-of-stake systems. This flaw operates through a fundamental design oversight that allows malicious actors to exploit the network's block validation mechanisms, creating a scenario where even minimal stake ownership can result in system degradation. The vulnerability specifically targets the handling of invalid block headers and data structures within the cryptocurrency's consensus protocol, where the system fails to adequately validate incoming data before storing it persistently on local storage devices.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization mechanisms within the alqo client software. When an attacker acquires even a small amount of stake or coins within the system, they can leverage this ownership to send malformed or invalid block headers to network participants. These invalid headers bypass normal validation checks and are subsequently stored on the victim's disk storage, creating a persistent data corruption issue. The flaw operates at the protocol level where the system assumes that incoming blocks from stakeholders are legitimate, failing to implement proper cryptographic verification or structural validation before committing data to the local blockchain database.
The operational impact of CVE-2018-19161 extends beyond simple service disruption to create a more insidious form of network degradation that can accumulate over time. Since invalid headers are stored locally on victim systems, the attack can lead to disk space exhaustion and performance degradation across the entire network. Network participants may experience increasing latency as their systems accumulate invalid data structures, potentially causing nodes to become unresponsive or unable to maintain proper synchronization with the blockchain. This vulnerability directly violates the principle of robustness in distributed systems and represents a failure in the system's ability to handle malicious inputs gracefully, creating a scenario where legitimate network participants become victims of their own protocol design.
This vulnerability aligns with CWE-248, an issue where an exception is thrown but not caught, and can be mapped to ATT&CK technique T1499.003, which involves network disruption through resource exhaustion. The attack vector demonstrates a classic example of how proof-of-stake systems can be vulnerable to resource-based attacks where attackers leverage their stake ownership to consume system resources without significant cost. The attack requires minimal stake ownership, making it particularly dangerous as it can be executed by anyone with access to a small amount of cryptocurrency, potentially allowing for widespread network disruption. The persistence of invalid data on disk storage creates a cumulative effect that can be difficult to detect and remediate, as the corrupted data may not be immediately apparent to system administrators.
Mitigation strategies for CVE-2018-19161 should focus on implementing comprehensive input validation and sanitization mechanisms within the alqo client software. Network participants should deploy enhanced monitoring systems that can detect unusual patterns of invalid block storage and implement automatic cleanup procedures for corrupted data structures. The protocol should be updated to include cryptographic verification of all incoming block headers before storage, ensuring that even stakeholder-owned blocks undergo proper validation. Additionally, network-wide rate limiting and reputation-based systems can help identify and isolate malicious actors who attempt to exploit this vulnerability. System administrators should regularly audit disk usage patterns and implement automated alerts for unusual storage consumption that may indicate the presence of this attack vector. The fix should also include implementing proper error handling mechanisms that prevent invalid data from being stored in the first place, aligning with security best practices for robust distributed systems design.